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Naji, M. |
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Motta, Antonella |
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Aletan, Dirar |
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Mohamed, Tarek |
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Ertürk, Emre |
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Taccardi, Nicola |
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Kononenko, Denys |
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Petrov, R. H. | Madrid |
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Alshaaer, Mazen | Brussels |
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Bih, L. |
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Casati, R. |
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Muller, Hermance |
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Kočí, Jan | Prague |
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Šuljagić, Marija |
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Kalteremidou, Kalliopi-Artemi | Brussels |
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Azam, Siraj |
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Ospanova, Alyiya |
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Blanpain, Bart |
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Ali, M. A. |
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Popa, V. |
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Rančić, M. |
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Ollier, Nadège |
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Azevedo, Nuno Monteiro |
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Landes, Michael |
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Rignanese, Gian-Marco |
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Miligy, Islam M.
in Cooperation with on an Cooperation-Score of 37%
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article
Retrospective observational study of HER2 immunohistochemistry in borderline breast cancer patients undergoing neoadjuvant therapy, with an emphasis on Group 2 (HER2/CEP17 ratio ≥2.0, HER2 copy number <4.0 signals/cell) cases
Abstract
<jats:title>Abstract</jats:title><jats:sec><jats:title>Background</jats:title><jats:p>The ASCO/CAP guidance on HER2 testing in breast cancer (BC) has recently changed. Group 2 tumours with immunohistochemistry score 2+ and <jats:italic>HER2</jats:italic>/<jats:italic>CEP17</jats:italic> ratio ≥2.0 and <jats:italic>HER2</jats:italic> copy number <4.0 signals/cell were re-classified as HER2 negative. This study aims to examine the response of Group 2 tumours to neoadjuvant chemotherapy (NACT).</jats:p></jats:sec><jats:sec><jats:title>Methods</jats:title><jats:p>749 BC cases were identified from 11 institutions. The association between HER2 groups and pathological complete response (pCR) was assessed.</jats:p></jats:sec><jats:sec><jats:title>Results</jats:title><jats:p>54% of immunohistochemistry HER2 positive (score 3+) BCs showed pCR, compared to 19% of immunohistochemistry 2+ FISH amplified cases. 27% of Group 2 treated with HER2 targeted therapy achieved pCR, compared to 19 and 11% in the combined Groups 1 + 3 and Groups 4 + 5, respectively. No difference in pCR rates was identified between Group 2 and Group 1 or combined Groups 1 + 3. However, Group 2 response rate was higher than Groups 4 + 5 (<jats:italic>p</jats:italic> = 0.017).</jats:p></jats:sec><jats:sec><jats:title>Conclusion</jats:title><jats:p>No difference in pCR was detected in tumours with a <jats:italic>HER2/</jats:italic>CEP17 ratio ≥2.0 and a HER2 score 2+ by IHC when stratified by <jats:italic>HER2</jats:italic> gene copy number. Our data suggest that ASCO/CAP HER2 Group 2 carcinomas should be evaluated further with respect to eligibility for HER2 targeted therapy.</jats:p></jats:sec>